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【Permutation】
- inputs: Num( numericsimple ), NumChosen( numericsimple ) ;
- condition1 = NumChosen >= 1 and Num >= NumChosen ;
- if condition1 then
- Permutation = Factorial( Num ) / Factorial( Num - IntPortion( NumChosen ) )
- else
- Permutation = -1 ;
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